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A good two word answer is environmentally irresponsible. You sentence would look like: Joe, in opposition to environment-friendly sentiments, has decided to engage in environmentally irresponsible behavior.
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Jay ElstonAug 15 '11 at 21:26

8 Answers
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The best way to complete the sentence is to rewrite it. The only meaningful English word in common currency is anti-environmentalist, but using that simply exposes how trivial the sentence actually is in the first place.

Joe has decided not to endorse environment-friendly sentiments would be an acceptable rewrite. I think Joe has decided to become an anti-environmentalist sounds odd, but maybe that would do.

A lot of answers which provide better style, but if you really wanted to complete THAT sentence, I think synthetic or extravagant might fit, depending on whether he's rebelling against the "natural" concept or "minimal waste" side of environmentalism.

Environmentalists picked the color green as a descriptor because it is associated with nature and growing things (plants, trees, grass, etc.). Since you want a parallel structure, I would pick a color which invokes the opposite idea. I'd use black due to its connotations of death.

You wouldn't want to say go black unless you're trying to reference the saying once you go black, you never go back.
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Jon PurdyAug 15 '11 at 21:10

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"Going black" implies Joe has taken up some nefarious undercover activity for an un-named government agency taking out troublesome greenies.
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BillAug 16 '11 at 4:09

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@Andrew - I assume this Joe character is rebelling because he doesn't believe the green claims - not actively trying to destroy the world, but just showing his disrespect for a view that he disagrees with. BTW - I'm not expressing my views here (I'm kinda light green), but I assume the goal here is to describe Joes motives, behaviour and character. "Going black" would suggest to me that he wants to be destructive and is using environmental vandalism as the method - he believes the green message - that his actions have real damaging consequences to the environment - but his goal is to destroy.
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Steve314Aug 16 '11 at 9:44

I would say that you could say that he had gone right, in reference to those in right leaning political spectrum that rebels from the green movement. This is likely to be neither insulting nor incorrect.

Using "right" in this context would be misleading and confusing. There are "right-leaning" people who support environmentally friendly techniques, so it is not an unequivocal antonym. Furthermore, "right" in this context can be mistaken for its use as a synonym of "accurate" or "correct", which is clearly an incorrect interpretation of the author's intent (he is clearly going for the more subjective meaning).
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BeofettAug 15 '11 at 19:46

@Beofett hmm interesting way of looking at that. Though environmentally friendly does not mean the same as green anymore.
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ChadAug 16 '11 at 14:18

unfortunately, I have an eye for puns ;) "Environmentally friendly" is the phrase used in the question.
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BeofettAug 16 '11 at 14:20